In New York City in 1914, eleven-year-old Susan encounters a mystery through an independent-minded female boarder and becomes involved in the growing suffrage movement.

In the early 1700s, twelve-year-old Suzette, an Ojibwa-French girl, hopes that her father will win the fur-trapping contest so that he can quit being a voyageur and stay with his family year-round, but when he is accused of stealing, Suzette must use her knowledge of both French and Ojibwa ways to find the real thief.

In 1865, while helping her family keep their Virginia farm going through the end of the Civil War, twelve-year-old Cassie meets a Confederate deserter and a Yankee prisoner of war and tries to discover who has been stealing from the farm.

In 1754, with her own parents taken captive, twelve-year-old Rebecca must confront her fear and hatred of the Abenaki when a boy raised by members of that tribe is brought to the fort at Charleston, New Hampshire, just before a series of thefts occurs.

At the start of the Klondike gold rush of 1897, while traveling through Canada with her father, uncle and friends, twelve-year-old aspiring author Hetty tries to determine the identity of a thief.

In 1878, twelve-year-old Ida Kate and her widowed father welcome a mail-order bride and her baby to their Kansas homestead, but Ida Kate soon suspects that the bride is not the woman with whom Papa has corresponded.

In the aftermath of the 1906 San Francisco earthquake, twelve-year-old Clara finds a baby left on the doorstep of her family's boarding house, and sets out to unravel the surrounding mysteries.

In the late nineteenth century, twelve-year-old Rhoda investigates her suspicion that a wrecker may be luring ships to their destruction on the Virginia barrier island where her father is Keeper of a U.S. Lifesaving Station. Includes historical notes on the United States Life-Saving Service.

When her family temporarily moves into a luxury apartment building in 1904 Manhattan, eleven-year-old Samantha tries to discover whether a series of mishaps is related to a curse on the building's owner.

In 1765, the arrival of an injured stranger from another tribe, traveling alone and apparently unable to speak, arouses suspicion in Kaya's Nez Percé village. Includes glossary and historical notes on the Nez Percé Indians.